Determining the Coefficient of Timeliness Harvesting of Rapeseed and its Effect on Small Crop Losses in North Khuzestan

One of the major challenges of rapeseed harvest is the right harvest time, control of harvest losses and the impact of harvest time on the quality of this product. This research was conducted in order to determine the rate of untimely harvesting of rapeseed (Hyola 401) in Khuzestan province, by the Mianab Agro Industry in the crop year of 2013-2014 with a combine harvester. Operational and field methods were used to obtain the required data. The studied parameters were quantitative harvest losses at three different times (5 days apart) and three humidity levels of 33, 17, and 13%. Harvesting was done homogeneously from the surface of cultivated fields in three times and three repetitions. To compare the average loss in different harvest times and to determine the effect of changes in harvest time on loss, one-way analysis of variance and LSD test were used. The results showed that the highest losses in the threshing and anti-threshing output of the combine with the amount of 1587.9 kilograms were related to early harvesting in the humidity of 33% in the second half of April, and on the other hand, the natural losses with the lowest amount were 4.35 kilograms. Came. Also, in timely harvesting with 17% humidity, the highest natural loss was 485.25 kg and the lowest loss related to the threshing and anti-threshing output of the combine was 25.80 kg. But in the late harvest, the natural losses were much higher, so that the natural losses were 848.21 kg and the lowest losses in the late harvest were at the threshing and anti-threshing output of the combine at the rate of 37.32 kg. By calculating the coefficient of untimely operations at the time of harvesting, it was determined that the farmers of the region will suffer an amount of 7684763 Rials on each day of early harvesting and 3252911 Rials per hectare on each day of late harvesting.